Creates a dictionary by quickly reading in an ASCII-based Sphinx-3 format
dictionary. When loaded the dictionary just loads each line of the dictionary
into the hash table, assuming that most words are not going to be used. Only
when a word is actually used is its pronunciations massaged into an array of
pronunciations.

The format of the ASCII dictionary is the word, followed by spaces or tab,
followed by the pronunciation(s). For example, a digits dictionary will look
like: